Stage 4 tracking

[bakkot]

This proposal achieved stage 3 at the February 2024 meeting. This is a tracking issue for getting stage 4.

• committee consensus
• open PR to the spec
  • editors have approved the PR
• write test262 tests - PR
  • merge test262 tests
• at least two implementations
  • JavaScriptCore (PRs 1, 2, 3) [in tech preview 202]
  • V8 (issue)
  • SpiderMonkey (issue) [in Firefox 133]
• significant in-the-field experience

[Delapouite]

Hi. This seems to be the bugzilla issue to follow about SpiderMonkey progress: https://bugzilla.mozilla.org/show_bug.cgi?id=1862220

[Delapouite]

Tracking bug for V8 https://bugs.chromium.org/p/v8/issues/detail?id=14620

[kisaragi-hiu]

This has been implemented in JavaScriptCore:

• Uint8Array.prototype.toBase64 and Uint8Array.prototype.toHex: https://bugs.webkit.org/show_bug.cgi?id=274635
• Uint8Array.fromBase64 and Uint8Array.prototype.setFromBase64: https://bugs.webkit.org/show_bug.cgi?id=276215
• Uint8Array.fromHex and Uint8Array.prototype.setFromHex: https://bugs.webkit.org/show_bug.cgi?id=275593

[trflynn89]

I'm assuming it doesn't quite count as an implementation, but just FYI we've implemented this in LibJS and did not find any bugs in the spec:
LadybirdBrowser/ladybird#1258

[Snuffleupagus]

This has now been implemented in SpiderMonkey, and will be enabled by default in Firefox 133:

• https://bugzilla.mozilla.org/show_bug.cgi?id=1885337
• https://bugzilla.mozilla.org/show_bug.cgi?id=1907302
• https://bugzilla.mozilla.org/show_bug.cgi?id=1917885